Issue #205: reset animate listener to fix flings

After the first fling, any movement on a view would get dismissed.
Apparently, the dismiss listener would remain on the view even if a new
animation was scheduled. So set the listener to null to get rid of the
prior listener to fix the issue. Tricky.
Issue #207: some more menu rearrangement

- Add subreddit info cab menu item.
- Use edit icon instead of plus sign when posting and commenting.
- Remove the queue icon for add subreddit with old plus icon.
- Remove add subreddit icon when viewing things.
- Make search icon priority again